Every seam, fastener and seal on the airframe has to stay electrically continuous. STM makes the materials that do.
STM engineers the conductive fabrics at the heart of aircraft signature management — and builds them into the low-observable seam treatments, seal materials, fastener fillers and fiber mats that keep every interruption in the skin conductive through flexing, heat, cold and fluid exposure. One qualified U.S. source for the survivability material stack.
Engineered and manufactured in the USA — Bloomfield, Connecticut, since 1955.
It starts with a high-level conversation. Initial response within 48 hours.
Most people arrive thinking STM makes fabric. They're not wrong. They're early.
"STM makes conductive fabric that gets used as a ground plane over seams and gaps."
Seam treatments and appliqués. Absorber-loaded coatings, with or without an embedded scrim. Conductive fabric engineered into seal systems. A conductive fastener filler. Fiber mats and veils for composite structure. And a lab that tests the stack to customer requirements and supports pre-qualification.
Three layers. The hard part is where they break.
The flat panels are the easy part. Every interruption in the skin — panel seams and gaps, fastener heads, doors, hatches, inlets, control surfaces, the canopy — has to stay electrically continuous while the aircraft flexes, heats, cools and sits in fuel and hydraulic fluid.
Conductive ground plane
An unbroken electrical layer across the outer mold line.
The fabric — for decades.Absorber layer
Loaded elastomer that dissipates electromagnetic energy.
Rides inside STM systems — coatings neat or loaded with radar-absorbing fillers.Continuity treatments
Seams, fasteners and seals kept electrically continuous.
The treatments themselves — tapes, seals, fillers, veils.DIAGRAM — three-layer section cutaway, illustrated · signature-control coating system in section view · no program-specific construction
A process.
Spray or hand-apply a conductive coating. Mask. Cure. Sand. Coat again — then rework it when it cracks or drops below spec. Paint can't hold a continuous path across a moving seam or reach inside a gap, and every touch-up repeats the whole cycle, on the production line and in the field.
A material.
Bridge the seam, fill the fastener cavity, put the conductive path inside the seal, lay a veil over composite — and keep continuity durably, with fewer masking and coating cycles, less cure time and less rework.
Follow the interruptions.
Hover a zone. Every one of them is a place the skin breaks — and a place STM keeps it electrically whole.
⚑ Bryan / Kaymen — Q18/Q19/Q25: zone sign-off, illustrator and budget. Imagery settled Oct 6: the F-35, line art. No numbers and no data sheets anywhere in this layer.A conformable, peel-and-stick treatment that bridges seams and panel breaks and keeps them electrically continuous through flexing, heat and fluid exposure. Hand-applied, no cure cycle.
Where panels open often, a treatment that comes off and goes back on — without masking, spraying and sanding.
A hot-melt conductive filler applied over fastener heads and small gaps, smoothed flush with the surface, ready for the coatings that follow. In development — ask us.
Conductive fabric engineered into the elastomeric seal, so continuity holds while the seal opens, closes and compresses.
The same seal integration where the aircraft moves the most. Compression tested.
The conductive path that has to reconnect every time the canopy closes.
A continuous electrical path over composite and other non-conductive surfaces, where conductive paint alone is not enough.
The conductive ground plane: the fabric that gives every treatment above its electrical path, and bridges panels, doors and hatches on its own.
- 1Panel seams and gaps
A conformable, peel-and-stick treatment that bridges seams and panel breaks and keeps them electrically continuous through flexing, heat and fluid exposure. Hand-applied, no cure cycle.
- 2Leading edges and maintenance-access areas
Where panels open often, a treatment that comes off and goes back on — without masking, spraying and sanding.
- 3Fastener heads
A hot-melt conductive filler applied over fastener heads and small gaps, smoothed flush with the surface, ready for the coatings that follow. In development — ask us.
- 4Doors, hatches and access panels
Conductive fabric engineered into the elastomeric seal, so continuity holds while the seal opens, closes and compresses.
- 5Weapons bay and landing gear doors, auxiliary inlets, control surfaces
The same seal integration where the aircraft moves the most. Compression tested.
- 6Canopy and cockpit
The conductive path that has to reconnect every time the canopy closes.
- 7Composite structure
A continuous electrical path over composite and other non-conductive surfaces, where conductive paint alone is not enough.
- 8Everywhere the skin is interrupted
The conductive ground plane: the fabric that gives every treatment above its electrical path, and bridges panels, doors and hatches on its own.
One qualified source for the low-observable material stack.
Seam treatments & appliqués
Adhesive, conductive fabric, elastomer — neat or loaded with radar-absorbing fillers — laminated with a pressure-sensitive adhesive for peel-and-stick application to the OML. Supplied in rolls, or cut into flat patterns and bonded over seams, gaps and panel breaks.
Survivability seals & gaskets — seal integration
Conductive fabric engineered into elastomeric seal systems — with absorber infused where the requirement calls for it — so doors, hatches, access panels and control surfaces keep their electrical continuity while the seal moves and compresses.
Conductive fastener filler
A next-generation conductive fastener filler developed to meet new material and cost requirements — a hot-melt system applied into the fastener-head cavity and smoothed flush with the surface, before the coatings that follow.
Conductive fiber mats & veils
Metal-plated non-wovens that lay a continuous electrical path over composite and other non-conductive structure, serve as the ground plane inside a tape or appliqué, and carry the connection across panels that open and close.
Conductive ground plane
Any STM fabric or scrim — standalone, or as the base of a seam treatment, seal or absorber system. Not a signature treatment by itself: the electrical foundation every treatment above is built on.
Airframes are where this stack lives today. The same materials serve ground vehicles and the warfighter — Low Observables — Land → RF Reflection & Signal Management →
Built for the buyers who qualify their suppliers as hard as their materials.
It starts with a high-level conversation. Engineer to engineer from there.
A high-level conversation.
With an STM expert — the 50,000-foot view: your role, the application area, the general timeline. Platform optional — we know why you might not name it. Initial response within 48 hours.
If the work calls for it, an NDA.
STM puts its NDA in place before anything specific is discussed. Our customers want it that way as much as we do.
Engineer to engineer.
Once the opportunity is defined, STM's engineers join the conversation and work the problem directly with yours.
Test and pre-qualify.
In-house characterization to your requirements, and support through pre-qualification — so the material you evaluate is the material you qualify.
A perceived technical risk on the platform — a seam, a seal, a filler, a gap that has to stay conductive. You engage before procurement is involved, and qualify the technology procurement will buy.
A supplier is putting delivery or quality at risk, and the program needs a qualified, U.S.-made, production-proven alternative in the stack — responsive enough to matter this year.
You won't find performance data or spec sheets on this page. That's deliberate: this data lives with the programs it belongs to, and we treat yours the same way. The specifics come later in the conversation — under STM's NDA when the work calls for one.
Asked on the first call.
I thought STM only made conductive fabric.
The fabric is the ground plane — the foundation. STM engineers it into seam treatments and appliqués, seal systems and fillers, loads the elastomers with radar-absorbing materials where the requirement calls for it, and tests the stack in-house. Most of what we ship is the engineered system, not the roll.
Do you sell direct, or through Tier 1 suppliers?
Both. STM supplies primes and Tier 1s directly, and supports programs indirectly through larger suppliers and integrators. Specifications flowed down to Tier 2 shops land here too — if a spec brought you to this page, you're in the right place.
Can you be a second source?
Yes. Many of these conversations start exactly there: procurement needs a qualified, U.S.-made alternative in the stack. Tell us the requirement at a high level; if the work calls for an NDA, STM puts its NDA in place before the specifics, and the evaluation follows.
What environments do these materials survive?
Wide temperature ranges, standard aerospace fluids, and the adhesion and flexing demands of flight. Specifics — ranges, methods, results — come once the opportunity is defined, under STM's NDA when the work calls for one.
Do we need an NDA, and who answers?
It starts with a high-level conversation — the 50,000-foot view of what you're doing. STM's business-development team screens every request first; if the work calls for an NDA, we put ours in place before we talk specifics, and an engineer joins once the opportunity is defined. Initial response within 48 hours.
Can you test and pre-qualify materials?
Yes. In-house electrical, mechanical, environmental and RF characterization, run to customer requirements, with support through pre-qualification.
Is the fastener filler available?
It's in development and entering qualification. If fastener continuity is on your problem list, ask us — that's exactly the conversation to have now.
Start the conversation.
Describe the mission at a high level — the application area, the environment, the timeline. An STM expert responds within 48 hours. If the work calls for an NDA, we put ours in place before we talk specifics, and engineering joins once the opportunity is defined.
Prefer to start with the fabrics themselves? The materials library and sample kit live here The materials →
Tell us the mission
It starts with a high-level conversation. An STM expert responds within 48 hours.
⚑ Bryan — final form design; leads route per the Brief's internal routing, never named on the page.+1.860.243.1122 · Fax 860.243.0848
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